// Create data for frame/tile given image data, offsets and duration.
static WebPMuxError CreateFrameTileData(const WebPData* const image,
int x_offset, int y_offset,
int duration, int is_lossless,
int is_frame,
WebPData* const frame_tile) {
int width;
int height;
uint8_t* frame_tile_bytes;
const size_t frame_tile_size = kChunks[is_frame ? IDX_FRAME : IDX_TILE].size;
const int ok = is_lossless ?
VP8LGetInfo(image->bytes_, image->size_, &width, &height, NULL) :
VP8GetInfo(image->bytes_, image->size_, image->size_, &width, &height);
if (!ok) return WEBP_MUX_INVALID_ARGUMENT;
assert(width > 0 && height > 0 && duration > 0);
// Note: assertion on upper bounds is done in PutLE24().
frame_tile_bytes = (uint8_t*)malloc(frame_tile_size);
if (frame_tile_bytes == NULL) return WEBP_MUX_MEMORY_ERROR;
PutLE24(frame_tile_bytes + 0, x_offset / 2);
PutLE24(frame_tile_bytes + 3, y_offset / 2);
if (is_frame) {
PutLE24(frame_tile_bytes + 6, width - 1);
PutLE24(frame_tile_bytes + 9, height - 1);
PutLE24(frame_tile_bytes + 12, duration - 1);
}
frame_tile->bytes_ = frame_tile_bytes;
frame_tile->size_ = frame_tile_size;
return WEBP_MUX_OK;
}
// Create data for frame/fragment given image data, offsets and duration.
static WebPMuxError CreateFrameFragmentData(
const WebPData* const image, int x_offset, int y_offset, int duration,
WebPMuxAnimDispose dispose_method, int is_lossless, int is_frame,
WebPData* const frame_frgm) {
int width;
int height;
uint8_t* frame_frgm_bytes;
const size_t frame_frgm_size = kChunks[is_frame ? IDX_ANMF : IDX_FRGM].size;
const int ok = is_lossless ?
VP8LGetInfo(image->bytes, image->size, &width, &height, NULL) :
VP8GetInfo(image->bytes, image->size, image->size, &width, &height);
if (!ok) return WEBP_MUX_INVALID_ARGUMENT;
assert(width > 0 && height > 0 && duration >= 0);
assert(dispose_method == (dispose_method & 1));
// Note: assertion on upper bounds is done in PutLE24().
frame_frgm_bytes = (uint8_t*)malloc(frame_frgm_size);
if (frame_frgm_bytes == NULL) return WEBP_MUX_MEMORY_ERROR;
PutLE24(frame_frgm_bytes + 0, x_offset / 2);
PutLE24(frame_frgm_bytes + 3, y_offset / 2);
if (is_frame) {
PutLE24(frame_frgm_bytes + 6, width - 1);
PutLE24(frame_frgm_bytes + 9, height - 1);
PutLE24(frame_frgm_bytes + 12, duration);
frame_frgm_bytes[15] = (dispose_method & 1);
}
frame_frgm->bytes = frame_frgm_bytes;
frame_frgm->size = frame_frgm_size;
return WEBP_MUX_OK;
}
WebPMuxError MuxGetImageWidthHeight(const WebPChunk* const image_chunk,
int* const width, int* const height) {
const uint32_t tag = image_chunk->tag_;
const WebPData* const data = &image_chunk->data_;
int w, h;
int ok;
assert(image_chunk != NULL);
assert(tag == kChunks[IDX_VP8].tag || tag == kChunks[IDX_VP8L].tag);
ok = (tag == kChunks[IDX_VP8].tag) ?
VP8GetInfo(data->bytes_, data->size_, data->size_, &w, &h) :
VP8LGetInfo(data->bytes_, data->size_, &w, &h, NULL);
if (ok) {
*width = w;
*height = h;
return WEBP_MUX_OK;
} else {
return WEBP_MUX_BAD_DATA;
}
}
int MuxImageFinalize(WebPMuxImage* const wpi) {
const WebPChunk* const img = wpi->img_;
const WebPData* const image = &img->data_;
const int is_lossless = (img->tag_ == kChunks[IDX_VP8L].tag);
int w, h;
int vp8l_has_alpha = 0;
const int ok = is_lossless ?
VP8LGetInfo(image->bytes, image->size, &w, &h, &vp8l_has_alpha) :
VP8GetInfo(image->bytes, image->size, image->size, &w, &h);
assert(img != NULL);
if (ok) {
// Ignore ALPH chunk accompanying VP8L.
if (is_lossless && (wpi->alpha_ != NULL)) {
ChunkDelete(wpi->alpha_);
wpi->alpha_ = NULL;
}
wpi->width_ = w;
wpi->height_ = h;
wpi->has_alpha_ = vp8l_has_alpha || (wpi->alpha_ != NULL);
}
return ok;
}
WebPMuxError MuxGetImageInfo(const WebPChunk* const image_chunk,
int* const width, int* const height,
int* const has_alpha) {
const uint32_t tag = image_chunk->tag_;
const WebPData* const data = &image_chunk->data_;
int w, h;
int a = 0;
int ok;
assert(image_chunk != NULL);
assert(tag == kChunks[IDX_VP8].tag || tag == kChunks[IDX_VP8L].tag);
ok = (tag == kChunks[IDX_VP8].tag) ?
VP8GetInfo(data->bytes, data->size, data->size, &w, &h) :
VP8LGetInfo(data->bytes, data->size, &w, &h, &a);
if (ok) {
if (width != NULL) *width = w;
if (height != NULL) *height = h;
if (has_alpha != NULL) *has_alpha = a;
return WEBP_MUX_OK;
} else {
return WEBP_MUX_BAD_DATA;
}
}
// Fetch '*width', '*height', '*has_alpha' and fill out 'headers' based on
// 'data'. All the output parameters may be NULL. If 'headers' is NULL only the
// minimal amount will be read to fetch the remaining parameters.
// If 'headers' is non-NULL this function will attempt to locate both alpha
// data (with or without a VP8X chunk) and the bitstream chunk (VP8/VP8L).
// Note: The following chunk sequences (before the raw VP8/VP8L data) are
// considered valid by this function:
// RIFF + VP8(L)
// RIFF + VP8X + (optional chunks) + VP8(L)
// ALPH + VP8 <-- Not a valid WebP format: only allowed for internal purpose.
// VP8(L) <-- Not a valid WebP format: only allowed for internal purpose.
static VP8StatusCode ParseHeadersInternal(const uint8_t* data,
size_t data_size,
int* const width,
int* const height,
int* const has_alpha,
int* const has_animation,
int* const format,
WebPHeaderStructure* const headers) {
int canvas_width = 0;
int canvas_height = 0;
int image_width = 0;
int image_height = 0;
int found_riff = 0;
int found_vp8x = 0;
int animation_present = 0;
int fragments_present = 0;
const int have_all_data = (headers != NULL) ? headers->have_all_data : 0;
VP8StatusCode status;
WebPHeaderStructure hdrs;
if (data == NULL || data_size < RIFF_HEADER_SIZE) {
return VP8_STATUS_NOT_ENOUGH_DATA;
}
memset(&hdrs, 0, sizeof(hdrs));
hdrs.data = data;
hdrs.data_size = data_size;
// Skip over RIFF header.
status = ParseRIFF(&data, &data_size, have_all_data, &hdrs.riff_size);
if (status != VP8_STATUS_OK) {
return status; // Wrong RIFF header / insufficient data.
}
found_riff = (hdrs.riff_size > 0);
// Skip over VP8X.
{
uint32_t flags = 0;
status = ParseVP8X(&data, &data_size, &found_vp8x,
&canvas_width, &canvas_height, &flags);
if (status != VP8_STATUS_OK) {
return status; // Wrong VP8X / insufficient data.
}
animation_present = !!(flags & ANIMATION_FLAG);
fragments_present = !!(flags & FRAGMENTS_FLAG);
if (!found_riff && found_vp8x) {
// Note: This restriction may be removed in the future, if it becomes
// necessary to send VP8X chunk to the decoder.
return VP8_STATUS_BITSTREAM_ERROR;
}
if (has_alpha != NULL) *has_alpha = !!(flags & ALPHA_FLAG);
if (has_animation != NULL) *has_animation = animation_present;
if (format != NULL) *format = 0; // default = undefined
image_width = canvas_width;
image_height = canvas_height;
if (found_vp8x && (animation_present || fragments_present) &&
headers == NULL) {
status = VP8_STATUS_OK;
goto ReturnWidthHeight; // Just return features from VP8X header.
}
}
if (data_size < TAG_SIZE) {
status = VP8_STATUS_NOT_ENOUGH_DATA;
goto ReturnWidthHeight;
}
// Skip over optional chunks if data started with "RIFF + VP8X" or "ALPH".
if ((found_riff && found_vp8x) ||
(!found_riff && !found_vp8x && !memcmp(data, "ALPH", TAG_SIZE))) {
status = ParseOptionalChunks(&data, &data_size, hdrs.riff_size,
&hdrs.alpha_data, &hdrs.alpha_data_size);
if (status != VP8_STATUS_OK) {
goto ReturnWidthHeight; // Invalid chunk size / insufficient data.
}
}
// Skip over VP8/VP8L header.
status = ParseVP8Header(&data, &data_size, have_all_data, hdrs.riff_size,
&hdrs.compressed_size, &hdrs.is_lossless);
if (status != VP8_STATUS_OK) {
goto ReturnWidthHeight; // Wrong VP8/VP8L chunk-header / insufficient data.
}
if (hdrs.compressed_size > MAX_CHUNK_PAYLOAD) {
return VP8_STATUS_BITSTREAM_ERROR;
}
if (format != NULL && !(animation_present || fragments_present)) {
*format = hdrs.is_lossless ? 2 : 1;
}
if (!hdrs.is_lossless) {
if (data_size < VP8_FRAME_HEADER_SIZE) {
status = VP8_STATUS_NOT_ENOUGH_DATA;
goto ReturnWidthHeight;
}
// Validates raw VP8 data.
if (!VP8GetInfo(data, data_size, (uint32_t)hdrs.compressed_size,
&image_width, &image_height)) {
return VP8_STATUS_BITSTREAM_ERROR;
}
} else {
if (data_size < VP8L_FRAME_HEADER_SIZE) {
status = VP8_STATUS_NOT_ENOUGH_DATA;
goto ReturnWidthHeight;
}
// Validates raw VP8L data.
if (!VP8LGetInfo(data, data_size, &image_width, &image_height, has_alpha)) {
return VP8_STATUS_BITSTREAM_ERROR;
}
}
// Validates image size coherency.
if (found_vp8x) {
if (canvas_width != image_width || canvas_height != image_height) {
return VP8_STATUS_BITSTREAM_ERROR;
}
}
if (headers != NULL) {
*headers = hdrs;
headers->offset = data - headers->data;
assert((uint64_t)(data - headers->data) < MAX_CHUNK_PAYLOAD);
assert(headers->offset == headers->data_size - data_size);
}
ReturnWidthHeight:
if (status == VP8_STATUS_OK ||
(status == VP8_STATUS_NOT_ENOUGH_DATA && found_vp8x && headers == NULL)) {
if (has_alpha != NULL) {
// If the data did not contain a VP8X/VP8L chunk the only definitive way
// to set this is by looking for alpha data (from an ALPH chunk).
*has_alpha |= (hdrs.alpha_data != NULL);
}
if (width != NULL) *width = image_width;
if (height != NULL) *height = image_height;
return VP8_STATUS_OK;
} else {
return status;
}
}
// Fetch '*width', '*height', '*has_alpha' and fill out 'headers' based on
// 'data'. All the output parameters may be NULL. If 'headers' is NULL only the
// minimal amount will be read to fetch the remaining parameters.
// If 'headers' is non-NULL this function will attempt to locate both alpha
// data (with or without a VP8X chunk) and the bitstream chunk (VP8/VP8L).
// Note: The following chunk sequences (before the raw VP8/VP8L data) are
// considered valid by this function:
// RIFF + VP8(L)
// RIFF + VP8X + (optional chunks) + VP8(L)
// ALPH + VP8 <-- Not a valid WebP format: only allowed for internal purpose.
// VP8(L) <-- Not a valid WebP format: only allowed for internal purpose.
static VP8StatusCode ParseHeadersInternal(const uint8_t* data,
size_t data_size,
int* const width,
int* const height,
int* const has_alpha,
WebPHeaderStructure* const headers) {
int found_riff = 0;
int found_vp8x = 0;
VP8StatusCode status;
WebPHeaderStructure hdrs;
if (data == NULL || data_size < RIFF_HEADER_SIZE) {
return VP8_STATUS_NOT_ENOUGH_DATA;
}
memset(&hdrs, 0, sizeof(hdrs));
hdrs.data = data;
hdrs.data_size = data_size;
// Skip over RIFF header.
status = ParseRIFF(&data, &data_size, &hdrs.riff_size);
if (status != VP8_STATUS_OK) {
return status; // Wrong RIFF header / insufficient data.
}
found_riff = (hdrs.riff_size > 0);
// Skip over VP8X.
{
uint32_t flags = 0;
status = ParseVP8X(&data, &data_size, &found_vp8x, width, height, &flags);
if (status != VP8_STATUS_OK) {
return status; // Wrong VP8X / insufficient data.
}
if (!found_riff && found_vp8x) {
// Note: This restriction may be removed in the future, if it becomes
// necessary to send VP8X chunk to the decoder.
return VP8_STATUS_BITSTREAM_ERROR;
}
if (has_alpha != NULL) *has_alpha = !!(flags & ALPHA_FLAG_BIT);
if (found_vp8x && headers == NULL) {
return VP8_STATUS_OK; // Return features from VP8X header.
}
}
if (data_size < TAG_SIZE) return VP8_STATUS_NOT_ENOUGH_DATA;
// Skip over optional chunks if data started with "RIFF + VP8X" or "ALPH".
if ((found_riff && found_vp8x) ||
(!found_riff && !found_vp8x && !memcmp(data, "ALPH", TAG_SIZE))) {
status = ParseOptionalChunks(&data, &data_size, hdrs.riff_size,
&hdrs.alpha_data, &hdrs.alpha_data_size);
if (status != VP8_STATUS_OK) {
return status; // Found an invalid chunk size / insufficient data.
}
}
// Skip over VP8/VP8L header.
status = ParseVP8Header(&data, &data_size, hdrs.riff_size,
&hdrs.compressed_size, &hdrs.is_lossless);
if (status != VP8_STATUS_OK) {
return status; // Wrong VP8/VP8L chunk-header / insufficient data.
}
if (hdrs.compressed_size > MAX_CHUNK_PAYLOAD) {
return VP8_STATUS_BITSTREAM_ERROR;
}
if (!hdrs.is_lossless) {
if (data_size < VP8_FRAME_HEADER_SIZE) {
return VP8_STATUS_NOT_ENOUGH_DATA;
}
// Validates raw VP8 data.
if (!VP8GetInfo(data, data_size,
(uint32_t)hdrs.compressed_size, width, height)) {
return VP8_STATUS_BITSTREAM_ERROR;
}
} else {
if (data_size < VP8L_FRAME_HEADER_SIZE) {
return VP8_STATUS_NOT_ENOUGH_DATA;
}
// Validates raw VP8L data.
if (!VP8LGetInfo(data, data_size, width, height, has_alpha)) {
return VP8_STATUS_BITSTREAM_ERROR;
}
}
if (has_alpha != NULL) {
// If the data did not contain a VP8X/VP8L chunk the only definitive way
// to set this is by looking for alpha data (from an ALPH chunk).
*has_alpha |= (hdrs.alpha_data != NULL);
}
if (headers != NULL) {
*headers = hdrs;
headers->offset = data - headers->data;
assert((uint64_t)(data - headers->data) < MAX_CHUNK_PAYLOAD);
assert(headers->offset == headers->data_size - data_size);
}
return VP8_STATUS_OK; // Return features from VP8 header.
}
static VP8StatusCode ParseHeadersInternal(const uint8_t* data,
size_t data_size,
int* const width,
int* const height,
int* const has_alpha,
int* const has_animation,
WebPHeaderStructure* const headers) {
int canvas_width = 0;
int canvas_height = 0;
int image_width = 0;
int image_height = 0;
int found_riff = 0;
int found_vp8x = 0;
VP8StatusCode status;
WebPHeaderStructure hdrs;
if (data == NULL || data_size < RIFF_HEADER_SIZE) {
return VP8_STATUS_NOT_ENOUGH_DATA;
}
memset(&hdrs, 0, sizeof(hdrs));
hdrs.data = data;
hdrs.data_size = data_size;
status = ParseRIFF(&data, &data_size, &hdrs.riff_size);
if (status != VP8_STATUS_OK) {
return status;
}
found_riff = (hdrs.riff_size > 0);
{
uint32_t flags = 0;
int animation_present;
status = ParseVP8X(&data, &data_size, &found_vp8x,
&canvas_width, &canvas_height, &flags);
if (status != VP8_STATUS_OK) {
return status;
}
animation_present = !!(flags & ANIMATION_FLAG);
if (!found_riff && found_vp8x) {
return VP8_STATUS_BITSTREAM_ERROR;
}
if (has_alpha != NULL) *has_alpha = !!(flags & ALPHA_FLAG);
if (has_animation != NULL) *has_animation = animation_present;
if (found_vp8x && animation_present && headers == NULL) {
if (width != NULL) *width = canvas_width;
if (height != NULL) *height = canvas_height;
return VP8_STATUS_OK;
}
}
if (data_size < TAG_SIZE) return VP8_STATUS_NOT_ENOUGH_DATA;
if ((found_riff && found_vp8x) ||
(!found_riff && !found_vp8x && !memcmp(data, "ALPH", TAG_SIZE))) {
status = ParseOptionalChunks(&data, &data_size, hdrs.riff_size,
&hdrs.alpha_data, &hdrs.alpha_data_size);
if (status != VP8_STATUS_OK) {
return status;
}
}
status = ParseVP8Header(&data, &data_size, hdrs.riff_size,
&hdrs.compressed_size, &hdrs.is_lossless);
if (status != VP8_STATUS_OK) {
return status;
}
if (hdrs.compressed_size > MAX_CHUNK_PAYLOAD) {
return VP8_STATUS_BITSTREAM_ERROR;
}
if (!hdrs.is_lossless) {
if (data_size < VP8_FRAME_HEADER_SIZE) {
return VP8_STATUS_NOT_ENOUGH_DATA;
}
if (!VP8GetInfo(data, data_size, (uint32_t)hdrs.compressed_size,
&image_width, &image_height)) {
return VP8_STATUS_BITSTREAM_ERROR;
}
} else {
if (data_size < VP8L_FRAME_HEADER_SIZE) {
return VP8_STATUS_NOT_ENOUGH_DATA;
}
if (!VP8LGetInfo(data, data_size, &image_width, &image_height, has_alpha)) {
return VP8_STATUS_BITSTREAM_ERROR;
}
}
if (found_vp8x) {
if (canvas_width != image_width || canvas_height != image_height) {
return VP8_STATUS_BITSTREAM_ERROR;
}
}
if (width != NULL) *width = image_width;
if (height != NULL) *height = image_height;
if (has_alpha != NULL) {
*has_alpha |= (hdrs.alpha_data != NULL);
}
if (headers != NULL) {
*headers = hdrs;
headers->offset = data - headers->data;
assert((uint64_t)(data - headers->data) < MAX_CHUNK_PAYLOAD);
assert(headers->offset == headers->data_size - data_size);
}
return VP8_STATUS_OK;
}